package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //先判断购物车中是否存在商品
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long id = BaseContext.getCurrentId();
        shoppingCart.setUserId(id);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果存在，数量加1
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            //执行修改语句
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果不存在，添加到购物车，数量默认为1
            //判断本次添加的是菜品还是套餐
            if(shoppingCart.getDishId() != null){
                Dish dish = dishMapper.getById(shoppingCart.getDishId());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
            }else{
                Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }

    }

    /**
     * 查看购物车
     * @param
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 删除购物车
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //先通过id查询数据库中的购物车数据
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
                //如果数量大于1，减去一个
            if(cart.getNumber() > 1){
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            }else{
                //如果数量等于1，删除该条数据
                shoppingCartMapper.deleteById(cart.getId());
            }
        }
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        log.info("清空购物车");
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteAll(userId);
    }
}
